Pith Number

pith:Y2SJGCN5

pith:2008:Y2SJGCN5UIGFDNJY5445D2FUHY

not attested not anchored not stored refs pending

The Long-Term Variability of the X-Ray Sources in NGC 6946 and NGC 4485/4490

Albert K. H. Kong, David Pooley, Jeroen Homan, Joel K. Fridriksson, Walter H. G. Lewin

arxiv:0804.1411 v2 · 2008-04-09 · astro-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Y2SJGCN5UIGFDNJY5445D2FUHY}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-07-04T15:15:06.139371Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c6a49309bda20c51b538ef39d1e8b43e17bdf7c33a378e903b11bac1e7cdc0d6

Aliases

arxiv: 0804.1411 · arxiv_version: 0804.1411v2 · doi: 10.48550/arxiv.0804.1411 · pith_short_12: Y2SJGCN5UIGF · pith_short_16: Y2SJGCN5UIGFDNJY · pith_short_8: Y2SJGCN5

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/Y2SJGCN5UIGFDNJY5445D2FUHY \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: c6a49309bda20c51b538ef39d1e8b43e17bdf7c33a378e903b11bac1e7cdc0d6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "288976305e1d4dc69fc325e08aeabc9afed64cca1fae39f32568e8a82e55cbc3",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-04-09T06:23:08Z",
    "title_canon_sha256": "4ae519a3904fe9542e186718b0ddf5f29487163c60ef063c6cde26e486af27b9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0804.1411",
    "kind": "arxiv",
    "version": 2
  }
}